I was told by a nice person that this is a rare Plasty doll called Miss Bunny and that she it was made in 1964 prior to Petra. She was sold with swimsuit and Bunny-ears. She is extremely rare because she was never mass produced. Thank you so much, Rob, for sharing this with me, I really didn't have a clue as to who she was, I got her in a mixed lot from Germany, but luckily kept her because I like her expression. I believe I'll look at the pictures shown on the internet and see if I can reproduce some years for her, the swimsuit is common and I have some.